How to get a day of the week by passing specific date and time in Java

Especially in English-speaking countries, the use of the calendar week is very common. The calculation and conversion are done with the class LocalDate in Java 8 and with Calendar in Java before version 8.

To get the specified day of a week. It can be achieved in two ways using Calendar class or using SimpleDateFormat class :
 

How To Get Day Of A Week Using Calendar Class

We can use the Calendar class to get a day of a week by passing a specific date in java as shown in the following example:

// Get date of a week 
public static String getWeek(Date date){
    String[] weeks = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    int week_index = cal.get(Calendar.DAY_OF_WEEK) - 1;
    if(week_index < 0){
        week_index = 0;
    }
    return weeks[week_index];
}

 

How To Get Day Of A Week Using SimpleDateFormat Class

We can use the SimpleDateFormat class to get a day of a week by passing a specific date in java as shown in the following example:

// Get day of a week according to date 
public static String getWeek(Date date){
    SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
    String week = sdf.format(date);
    return week;
}

For the parameters passed in to create SimpleDateFormat: EEEE stands for week, Such as “Thursday”; MMMM represents month, such as “November”; MM represents month, such as “11”;

yyyy represents the year, such as “2010”; dd represents the day, such as “25”.
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